A177807 Numbers k that divide 17^k - 1.

1, 2, 4, 6, 8, 12, 16, 18, 20, 24, 32, 36, 40, 42, 48, 54, 60, 64, 72, 78, 80, 84, 96, 100, 108, 116, 120, 126, 128, 144, 156, 160, 162, 168, 180, 192, 200, 216, 220, 232, 234, 240, 252, 256, 288, 294, 300, 312, 320, 324, 336, 342, 348, 360, 378, 384, 400, 420

Offset: 1

Author

Alexander Adamchuk, May 17 2010

Keywords

• nonn

Links

• Zizheng Fang, Table of n, a(n) for n = 1..10000
• Zizheng Fang, Python program to generate A177807

Crossrefs

Cf. A014960, A014956, A014957, A014951, A014949, A014946, A014945, A067945, A128358, A128360, A177805.

Programs

Mathematica

{1}~Join~Select[Range[420], PowerMod[17, #, #] == 1 &] (* Giovanni Resta, Jan 30 2020 *)